What is SIS made of?
The basic components of the SIS system can be roughly divided into three components: sensor unit, logic operation unit, and final execution unit.
Related introduction:
Safety instrumentation system, Safety instrumentation System, referred to as SIS; also known as safety interlocking system (Safety interlocking System). It is mainly the alarm and interlocking part of the factory control system. It implements alarm actions or adjustments or shutdown control based on the detection results in the control system. It is an important part of the automatic control of factory enterprises.
Features
(1) Taking IEC61508 as the basic standard, it complies with the safety standards for instruments stipulated by the International Safety Association.
(2) It has wide coverage, high safety, self-diagnosis function, and can detect and prevent potential dangers.
(3) Fault-tolerant multiple redundant system. SIS generally adopts multiple redundant structures to improve the system's hardware failure margin. A single failure will not cause the loss of SIS safety functions.
(4) The application program is easy to modify, and the software can be modified according to actual needs.
(5) The self-diagnosis coverage is large, and the number of points that workers need to check during maintenance is relatively small.
(6) The response speed is fast. The response time from input change to output change is generally about 10-50ms. The response time of some small SIS is shorter.
(7) It can realize the safety design of the entire circuit from the sensor to the actuator, and has monitoring functions such as I/O short circuit and disconnection.
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